RangeError: Out of memory at ProcessNext

RangeError: Out of memory
    at RangeError (native)
    at processNext (packages/ddp-server/livedata_server.js:563:10)
    at unblock (packages/ddp-server/livedata_server.js:550:11)
    at packages/ddp-server/livedata_server.js:562:clock9:

I need help on the above error message in my production server. It seems like this is something different from the other topics. I am using PM2 to manage my cluster and every time before the error message happened, the CPU is running very high. I need to restart the cluster to stop the high CPU usage.